Introduction: Add a Fan to a Computer Heat Sink - No Screws Required

Picture of Add a Fan to a Computer Heat Sink - No Screws Required

The problem: I have (had) a motherboard on my file server with a fanless heatsink over what I believe is the northbridge. According to the sensor program (ksensors) I had running in Fedora, the motherboard temperature was holding around 190F. My laptop doesn't get that hot! I wanted to add some more cooling to that chipset without having to modify anything on the motherboard.

As you can see from the picture, the heatsink is in a very inconvenient location - right up against the CPU heatsink. This gave me something I had to work around, which I think I did.

Step 1: Tools and Materials

This mod only requires a few things:

  • Plyers
  • Wire stripper
  • Tiny screwdriver (eyeglasses type)

  • Motherboard to be modded
  • Arctic Silver 5 thermal paste (or another brand, but AS5 is the best)
  • Isopropyl (rubbing) alcohol - the closer to 99% purity the better
  • lintless cloth (coffee filters work well too)
  • 1 foot of 22 gauge solid strand copper wire
  • 40mm fan

Step 2: Heatsink Removal

Picture of Heatsink Removal

The heatsink on my board was held on by two plastic tabs that poked through to the back. It was a simple matter of squeezing the snap-locks on the tabs and pushing them through (carefully!). Plyers work best.

In my case there was a double-sided sticky pad keeping my heatsink on the chipset. This was a bit of a pain to pull off but it eventually did yield. Yours might just have thermal paste. In any case, what you want to do is clean the chipset and the bottom of the heatsink completely and make sure there is no dust or lint on it.

Step 3: Add Thermal Paste

Picture of Add Thermal Paste

With both surfaces clean as can be, take out your tube of Arctic Silver 5. That tube is small, but it lasts a long time. You only need about as much as a half a grain of rice for smaller chips (say, less than the size of a standard postage stamp) and twice that for somthing the size of a CPU. Put a little blob in the middle of the chip.

Now you want to put the heatsink back on. Take care to seat it evenly so that the AS5 spreads across the entire chip and not just one part of it. Press those tabs back through the motherboard and make sure it's locked in place.

Step 4: Mount the Fan

Picture of Mount the Fan

Now it's time to put that fan on. I happened to have a 40mm fan from an old CPU heatsink laying around, so I used that. I had to solder it to a passthrough connector to give it power, but you might be able to skip this step. (I gave myself a nice burn with the iron doing this, so be careful if you do).

Well now, that fan is bigger than the heatsink. No problem - we'll use the copper wire to suspend the fan above the heatsink. Cut the foot of wire into two 6" lengths and strip the plastic coating off (if there is one). Now snake the wire between the fins of the heatsink, stretching from corner to corner. Push the wire down with the mini screwdriver. Then wrap the ends around the corner fins and push that down too. Leave the ends sticking up from the heatsink.

Now slide your fan on the copper wire, threading the ends through the screw holes. Then take the plyers and bend the wire down and twist it around itself to lock the fan in place. Voila - the fan is now ready for use.

Step 5: Test It Out - Conclusion

Close everything up and fire that computer up. Hopefully you should see some reduction in the chip temperature (assuming you did everything right). If the temperature is higher, you probably buggered it when you added the AS5 and put the heatsink back on.

This mod didn't actually lower the temperature of the sensor on my computer, but I'm guessing that that sensor was for a different chip entirely. Hmm. Oh well - it'll help cool a hot chip in any case.


miphz (author)2011-02-15

brilliant ... nice share mate ...

vikas bharti (author)2009-03-31

very good idea for pc cooling.......... but dont remove motherboard heatsink

Yerboogieman (author)2008-03-30

all i have is a 120mm fan

djr6789 (author)Yerboogieman2009-02-18

you can buy adapters on ebay that size your fan down upt o 60mm

technopenguin (author)2007-09-02

190 degrees Fahrenheit? Almost enough to boil water.... I'm suprised the motherboard wasn't fried, maybe it was designed for that. But I would definitely cool it if it were me. Did you already have the fan on the left when it was at 190 degrees?

frazeeg (author)technopenguin2007-09-03

Just as a FYI as well, the GeForce 8800 series (some versions) can get that hot and above and still function. Tom's Hardware did a review on some coolers and found that out.

uberinsane (author)frazeeg2008-01-24

Having the GPU run that hot for very long would probably kill it.

frazeeg (author)uberinsane2008-01-25

Only if it's not rated for that temperature. But regardless, whether it's rated at that temperature or not, I agree that's it's still not good to be running that hot.

uberinsane (author)frazeeg2008-01-25

I think it's only rated for 70*C but I might be wrong...

ReCreate (author)uberinsane2009-02-02

my processor is at 88* that ...bad?

technopenguin (author)ReCreate2009-02-07

88ºC is about 190ºF. That is bad if your CPU wasn't rated for that. Is this occurring in a server or a personal computer?

ReCreate (author)technopenguin2009-02-07

its a personal computer it has windows xp sp2 by the way

technopenguin (author)ReCreate2009-02-08

Either the sensor is malfunctioning (like frazeeg said his may have been) or there is a heat problem. You could put your hand a few inches from the CPU and see if there is a lot of heat. Don' t actually touch the CPU unless you're sure it's okay.

frazeeg (author)technopenguin2007-09-03

Yes, that fan was there. I'm almost certain that sensor isn't reliable. I felt all around the motherboard with it running and didn't come anywhere near to burning my hand, so either the sensor is faulty or lm_sensors isn't reading it correctly.

Derin (author)2009-02-04

You have a NB fan slot right there.What is that connector labeled with?

frazeeg (author)Derin2009-02-04

Where is the slot you're talking about? If it's next to that copper coil, that's for the CPU fan.

Derin (author)frazeeg2009-02-05

It is right beside the heatsink.

Derin (author)Derin2009-02-05

At the left down corner.

Mario1 (author)2009-01-31

Great cable management :)

alleria (author)2008-07-01

usually what i use is heat sinks i have laying around off of mobos vid cards. Im sure at some time i bought a kit and i have bought a few orbs for vid cards, but i rarely buy anything. 1 friend laughed when i put a p3 heatsink on a nvidia card darn thing took up 2 slots for the heat sink it self. I remeber putting a heatsink on a little pci card a few yrs ago darn thing was prolly only worth 10 bux if that but on the other hand it wasnt a big heatsink either. I always say when its late and you need to get something running what ever works works.

alleria (author)2008-06-30

imho if your going to remove the heatsink that came with the board why bother putting it back on. but that is a pretty kewl way to get a fan to stay where you want

frazeeg (author)alleria2008-06-30

I'm not gonna pay for an aftermarket heatsink if that's what you mean. Especially not for a low-intensity system.

MD_Willington (author)2007-07-30

ECS KT series mainboard??

frazeeg (author)MD_Willington2007-07-30

ECS K8M800-M2 I wish though that I had gotten one with Hot Swap for the SATA ports...but that's another story.

MD_Willington (author)frazeeg2007-07-30

I've done similar on my Biostar system and my ECS K7S5A... Cooling always helps!

!Andrew_Modder! (author)2007-07-30


About This Instructable




Bio: I love to tinker with just about anything but some favorites are woodworking and other crafty things. I also enjoy repurposing otherwise useless things like ... More »
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